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Note 3 - Business Combinations - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
May 01, 2015
Goodwill $ 42,193 $ 42,355  
RadioPulse [Member]      
Cash, restricted cash and cash equivalents     $ 196
Accounts receivable     1,497
Inventories     534
Property, plant and equipment     24
Prepaid expenses and other current assets     547
Identifiable intangible assets     2,867
Short-term borrowings     (2,354)
Accounts payable     (614)
Accruals and other liabilities     (1,926)
Total identifiable net assets     771
Goodwill     14,887
Total purchase consideration     $ 15,658